Question

x的2次方除于(1.64-2x)的2次方等于400,x等于多少?

Answer 1

x/(1.64-2x)=±20

x/(1.64-2x)=-20

x=-32.8+40x

39x=32.8

x=164/195

x/(1.64-2x)=20

x=32.8-40x

41x=32.8

x=0.8

所以

x=164/195,x=0.8